What are /r/MountainMen's favorite Products & Services?

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This is something just a little bit different but its a fascinating story.

This guy lived in the woods of North Central Idaho for a time in the 40s I think, and generally existed and survived in place no one thought he could.

One Man's Wilderness by Sam Keith and Richard Proenneke is an absolute classic.

Indian Creek Chronicles by Pete Fromm is another of my favorites.